Thread-protector for pipes.



' m. H. RAY OND, THREAD PROTECTOR FOR PIPES.

APPLICATION FILED MAY 26, I915.

LQWAWQ Patenfi d Feb. 5 1918.

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NELSON H. RAYMOND, F IBUFFALO, NEW YORK, ASSIGNOR T0 CLIFTON MANUFAC- TURING 00., 0F JAMAICA PLAIN, MASSACHUSETTS, A CORPORATION OF NEW JERSEY.

THREAD-PROTECTOR- FOR PIPES.

Specification of Letters latent.

Application iea ua ze, 1915. SerialNo.30,537.

To all whom it may concern V external screw threads 2 for .use in connect-- ing the same by a couplingsleeve with another pipe of the same character when m- While shipping or handling the same.

It is the object of this invention to provide simple, inexpensive and efficient means whereby the above mentioned purpose is accomplished;

In the accompanying drawings:

Figure 1 represents a longitudinal section of an electric conduit or pipe having its threads protected by the preferred form of my invention. Fig. 2 is an. end elevation of the same. Fig. 3 isa cross section-thereof taken in line 3-3, Fig. 1.

\ Similar characters of reference indicate corresponding parts throughout the several views. a,

1 represents an electric conduit or pipe which is usually constructed 'of. iron and provided on the end of its periphery with stalling the same inthe'building preparatory to wiring the same for electricity.

These pipes are usually covered on the 'inner'and outer sides thereof with a coating of enamel for thepurpose of protecting the pipes against rustmg and also to serve as an electrical insulation. When dipping these pipes in'enamel the external coupling threads'thereof also become filled, coated qr covered with enamel which usually necessltates re cutting the threads by a suitable tool in order. to clean off the enamel before the pipes c'an be assembled and installed in a building. 1

Furthermore, when these pipes are shipped or handled after the threads are thus cut on the same the latter are liable to become burred or injured which necessitates running a tool over the same in order to put the threads in condition for coupling the pipes properly. i

To prevent the threads of the pipes or at Patented m. a, rare.

least a considerable part of those adjacent to the ends of the pipes from being coated with enamel'while the pipes are being dipped in this material, a protecting device is provided which is. preferably constructed in the form of a ferrule'or cap and comprises a tubular body 3 which. surrounds the end portion of a pipe so as to cover all or most of the threads, and an inwardly projecting annular flange 4 arranged atthe outer end of this tubular bodv and engaging with the adjacent end of the pipe. This protecting fer rule is preferably constructed of a very thin metal such as sheet brass and the tubular body is made of such diameter that when applied to the end of a pipe the same will engage frictionally therewith and be held against displacement thereon while this pipe is being manipulated when dipped in enamel or handled during transportation.

W hen the pipehaving its thread and'end covered with the sleeve and flange is dipped into the enamel thelatter will form a protecting coating on the exposed surfaces of the pipe, sleeve and flange but the threads will not be covered with enamel.

When a ferrule is thus applied to the threaded portion a of a pipe these threads will remain unenamaled as the ipe is dipped in an enamel bath for coating the 1 same, whereby the peripheral covering or I coating of enamel 0n the pipe is confined to the unthreaded portion of the outer side of the pipe. If a few of the innermost threads become coated with enamel by reason of the ferrule being somewhat short it is not particularly objectionable it being sufficient for all practical purposes so long as the ferrule covers the threads from the front or outer end of the pipe inwardly fora considerable portion of these threads.

When this pipe is being shipped from the factory to' the place where it is to be installed the threads, particularly those nearthe end of the pipe, are protected against burring or injury. Preparatory to'assembling pipe.

v with others and installing the same in a building the protecting ferrule may be easily removed by means of a knife, screw driver or similar instrument. When thus uncovered the thread will be found free from'enamel and also in an uninjured condition, so.-

that no re-cutting or cleanin of the threads is necessary in order to put 1; e same in condition for use. a

This means of protecting the threads of electric conduits or pipes permits'the installation of the same to be efl'ected more expeditiouslyand conveniently and also at reduced cost on account of the saving in time which otherwise would be spent in cleaning and re-cutting the threads preparatory to installation.

I claim as my lnventlonz v A new artlcle of manufacture comprisln a pipe having an external taperin threa at its end, an unthreaded seamless s eeve fitting frictionally upon the exterior of the pipe and covering the threads and the adjacent unthreaded part thereof and provided posed surfaces of said conduit and said sleeve and flanges.

NELSON H. RAYMOND. 

